If we're going to do history, let's get it right. The Royal HH and REs offered color in the '52-54 range, but they were the exception rather than the rule. These are very difficult to find now. The Quiet De Luxes didn't get color until into 1956 and continued until 1958 when they were replaced by the (also) colorful Royal Futuras.

There were pockets of the late 20s and early 30s when Royal and Underwood among others experimented with color on portables as well, but these tended to be more basic reds, blues, and greens. The Corona 4s models were finished in DuPont DUCO® from 1927 to 1939. In a similar time period the Royal P also came in a small variety of colors.